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TheEffectofSwirlonBoundaryLayer-FlashbackProcessesforHydrogen-Rich
Gas-TurbineCombustion
JamesBaileyEdwardRichardson
Weacknowledgefinancialsupport fromtheEPSRCCentreforDoctoralTraininginNextGenerationComputationalModellinggrantEP/L015382/1.
12/09/2019
Background
https://www.researchgate.net/profile/Ieuan_Owen/publication/282796815/figure/fig14/AS:668870398464013@1536482538619/A-Siemens-industrial-gas-turbine-engine-showing-the-components-of-a-generic-DLE.png
• Industrialgasturbines• Fuel-flexibleburnerandalternativefuels
Flashback
FlashbackinPlanarChannels
Gruberetal.,JournalFluidMechanics,2012,709,516-542
FlashbackinSwirlingFlows
Ebi andClemens,CombustionandFlame,2016,168, 39-52
FlashbackinSwirlingFlows
Ebi andClemens,CombustionandFlame,2016,168, 39-52
Methodology
Methodology
Floworientation
Radialpressuregradient
𝐹𝑟 = ∞ 𝐹𝑟 = 0.25
Normal
Oblique
𝑓
Methodology
• Physicalaspectsofswirl:• Floworientation
Flamefront
𝜃 = 45°Oblique flow
𝜃 = 90°Normalflow
Flowdirection
Δ𝑥01
Δ𝑥01
2Δ𝑥01
Methodology
• Physicalaspectsofswirl:• Radialpressuregradient
𝑓
3435= 𝜌 78
9
5= 𝑔
𝑟𝐹𝑟 = 𝑆<𝑔=𝛿?
𝑔= = 𝑔𝜌@ − 𝜌B𝜌@
𝑟
Methodology• Reacting,turbulentchannelflow• DirectNumericalSimulation• Fullycompressibleflow• Detailedchemistry• Time-evolvingturbulence• Combustioncode:S3D
𝑅𝑒E = 180
ℎ = 5.76𝑚𝑚
𝑈B@?M = 43𝑚/𝑠
Methodology
𝑆Q𝑆<= 𝑓𝐼S
𝐴Q𝐴?
Turbulentflamespeed
Laminarflamespeed
Flowfactor
Intensificationfactor
Turbulentflamearea
Laminarflamearea
𝑆Q𝑆<
𝑓
𝐼S
𝐴Q
𝐴?
Methodology
𝑆Q𝑆<= 𝑓𝐼S
𝐴Q𝐴?
Turbulentflamespeed
Laminarflamespeed
Flowfactor
Intensificationfactor
Turbulentflamearea
Laminarflamearea
𝑆Q𝑆<
𝑓
𝐼S
𝐴Q
𝐴?
Edgeflame
𝑈U𝑆<S~
𝜌@𝜌B
W/X
Results– ObliqueFlow
FlameShape
NormalFlow ObliqueFlow
FlashbackSpeed
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓Bodyforce
FlameSurfaceDensity
𝑦1 = 5
𝑦1 = 5
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↓Bodyforce
Stretch𝑦1 = 5
DisplacementSpeed
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↑ ↓ ↓Bodyforce
Flowfactor
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce
Results– BodyForce
FlameShape
Nobodyforce Bodyforce𝐹𝑟 = ∞ 𝐹𝑟 = 0.25
FlashbackSpeed
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce ↑
FlameSurfaceDensity
𝑦1 = 5
𝑦1 = 5
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce ↓ ↑
Stretch 𝑦1 = 5
DisplacementSpeed
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce ↔ ↓ ↑
FlowFactor
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce ↑ ↔ ↓ ↑
Buoyancy
𝑢U = 0.7 𝑔(𝜌@ − 𝜌B)
𝜌`ℎU
𝑔 = 𝜌𝑉bX
𝑟
𝑢U ℎU
Averagedensity𝜌`
𝑈B@?M − 𝑢U ≈ 42𝑚/𝑠
𝑈B@?M − 𝑉U ≈ 55𝑚/𝑠
Conclusions
Conclusions
• Darrieus-Landauhydrodynamicinstabilitydominateseffectsofstreaks• Flowdiversionandbuoyancyhavesignificanteffectsonflamepropagation
FutureWork
• Simulationofannulususingaxi-symmetricco-ordinates
Thankyou
Weacknowledgefinancialsupport fromtheEPSRCCentreforDoctoralTraininginNextGenerationComputationalModellinggrantEP/L015382/1.
12/09/2019
JamesBailey– [email protected]
